Show some response concerning part of the play (5)

I believe the answer is:

react

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'show some response concerning part of the play' is the definition.
I can't tell whether this definition defines the answer.

'concerning part of the play' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'part of the play' becomes 'act' ('act' is part of 'play').
're'+'act'='REACT'

Can you help me to learn more?

(Other definitions for react that I've seen before include "Hit back" , "provide an answer" , "Take" , "Act as opponent" , "Respond to something" .)

I've seen this clue in The Globe and Mail.

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